On the fsfs-format7 branch:  Fix one of the svnadmin test cases.

* subversion/libsvn_fs_x/low_level.c
  (svn_fs_x__unparse_representation): produce the exact same textual
                                      noderev representation as FSFS

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1507267 13f79535-47bb-0310-9956-ffa450edef68